linux-kernel - [PATCH] tty: serial: imx: initialize peripheral_config/peripheral

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Message-Id: <20220803065737.14752-1-sherry.sun@nxp.com>
Date:   Wed,  3 Aug 2022 14:57:37 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH] tty: serial: imx: initialize peripheral_config/peripheral_size for sdma config

Since commit 824a0a02cd74 ("dmaengine: imx-sdma: Add multi fifo support")
adds the use of dma_slave_config->peripheral_config/peripheral_size to
sdma driver, the client drivers like uart need to initialize the
peripheral_config/peripheral_size for sdma, otherwise, the random value
of local variable slave_config may cause unexpected peripheral_config
and make sdma mess up.

Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 drivers/tty/serial/imx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 522445a8f666..bb8c2a712e94 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1320,6 +1320,8 @@ static int imx_uart_dma_init(struct imx_port *sport)
 	slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	/* one byte less than the watermark level to enable the aging timer */
 	slave_config.src_maxburst = RXTL_DMA - 1;
+	slave_config.peripheral_config = NULL;
+	slave_config.peripheral_size = 0;
 	ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config);
 	if (ret) {
 		dev_err(dev, "error in RX dma configuration.\n");
@@ -1346,6 +1348,8 @@ static int imx_uart_dma_init(struct imx_port *sport)
 	slave_config.dst_addr = sport->port.mapbase + URTX0;
 	slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	slave_config.dst_maxburst = TXTL_DMA;
+	slave_config.peripheral_config = NULL;
+	slave_config.peripheral_size = 0;
 	ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config);
 	if (ret) {
 		dev_err(dev, "error in TX dma configuration.");
-- 
2.17.1